Switchs drain all call to new thread

src/prefect/logging/handlers.py

@@ -108,7 +108,7 @@ def flush(cls):
 
             # Not ideal, but this method is called by the stdlib and cannot return a
             # coroutine so we just schedule the drain in the global loop thread and continue
-            from_sync.call_soon_in_loop_thread(create_call(APILogWorker.drain_all))
+            from_sync.call_soon_in_new_thread(create_call(APILogWorker.drain_all))
             return None
         else:
             # We set a timeout of 5s because we don't want to block forever if the worker